Adjust boost gcd based on version (#2238)
Adjust boost gcd based on version (#2238)

The GCD functionality moved several versions ago, from boost::math to
boost::integer. It's been "replicated" in both places for a while, but
at least on 1.69, it issues warnings. At some point it will be
permanently moved. So let's get out ahead of that potential breakage.
lgritz/oiio,lgritz/oiio,lgritz/oiio,OpenImageIO/oiio,OpenImageIO/oiio,lgritz/oiio,OpenImageIO/oiio,OpenImageIO/oiio